A comparative study of fluoride ingestion levels, serum thyroid hormone & TSH level derangements, dental fluorosis status among school children from endemic and non-endemic fluorosis areas

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Table 6 Correlation analysis between fluoride content in body fluids and their effect FT3, FT4, TSH within Group 1

Parameters	Spearman rho analysis	FT₃	FT₄	TSH	WF	UF	SF
FT₃	'r’	1	-0.169	-0.252	-0.711	-0.388	-0.400
FT₃	p-value	-	0.196	0.052*	0.000**	0.002**	0.002**
FT₄	'r’	-0.169	1	-0.079	0.196	0.119	0.119
FT₄	p-value	0.196	-	0.547	0.134	0.365	0.366
TSH	'r’	-0.252	-0.079	1	0.151	0.079	0.552
TSH	p-value	0.052*	0.547	-	0.250	0.550	0.000**
WF	'r’	-0.711	0.196	0.151	1	0.690	0.529
WF	p-value	0.000**	0.134	0.250	-	0.000**	0.000**
UF	'r’	-0.388	0.119	0.079	0.690	1	0.525
UF	p-value	0.002**	0.365	0.550	0.000**	-	0.000**
SF	'r’	-0.400	0.119	0.552	0.529	0.525	1
SF	p-value	0.002**	0.366	0.000**	0.000**	0.000**	-

^*Correlation is significant at 0.05 levels (2 tailed), **Correlation is highly significant below 0.01 levels correlation coefficient(r).